Angel Luis Santiago, 35, of Center Street, appeared before Superior Court Judge Richard Arnold shortly before 1 p.m. Public Defender David Egan entered the "not guilty" plea. Santiago was arrested in December on a warrant in the death of Kyle Robinson.

Santiago is charged with manslaughter and assault, both in the first degree, and risk of injury to a minor.

According to an arrest warrant affidavit Kyle's injuries were "consistent with the head being shaken." Scroll down to read the warrant.

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Kyle died of severe trauma, with injuries to his brain, neck, spinal cord and eyes, according to the arrest warrant affidavit. The tot was shaken so violently that his spinal cord separated from his brain, the warrant affidavit said.

During Thursday's brief court appearance, Santiago appeared in a beige prison jumpsuit, and did not speak. Arnold said a "large amount" of discovery had just been turned over by Milford State's Attorney Kevin Lawlor to Egan, including medical records.

Arnold continued the case until April 11 so both sides can review the records. Lawlor noted Santiago does not have a violent criminal background.

It's expected that the case will remain in pre-trial conference for a year before there is any possible resolution.

Relatives declined to comment.

Kyle was the son of Kelly Robinson-Maresca of 41 Hubbell Ave., Ansonia. The baby and his two brothers were being watched June 10 in the second-floor apartment by her boyfriend, Santiago. Robinson-Maresca was at work.

Police were called at about 7:20 p.m. on a report of an unresponsive child. The baby was taken to Griffin Hospital in Derby for immediate treatment and then transferred to Yale-New Haven Hospital, where he was put on life support. He died the next day.

Santiago is being held in lieu of $1 million bail.

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